Răspuns:
Exercitiul 5:
a)-4,7xy+1,8xy = -2,9xy
b) -3x^2*4xy = -12x^3y
c) (-40a^3b^2):(8a^2b) = -5ab
d) = -27x^3y^3
Ex 6:
= 2x^2-6x+x-3+x^2+4x+4-3x^2+12x
= 0+11x+1
= 11x+1.
EVERGREEN
